Turbine wheel



P. H. STEVENSON ,4

TURBINE WHEEL Filed Jan. 11, 1946 INVENTOR (fa/1% Al.

Patented Dec. 28, 1948 UNITED STATES PATENT OFFICE 4 Claims.

The object of this invention is to so construct a turbine wheel that it will be simple, cheap and light, while at the same time the blades are so attached to the hub that they will resist the action of centrifugal force and its tendency to disrupt the turbine Wheel when it is run at extremely high speeds. To prove the value of the construction hereinafter described it may be averred that a turbine wheel so constructed has been turned at a very high speed Without showing any tendency to disruption.

I attain my object by constructing the turbine Wheel as shown in the accompanying drawings in which Figure 1 shows the turbine wheel with one of the side plates removed and the blades exposed. Figure 2 shows the turbine wheel complete with the side plates in place. Figures 3, 4 and 5 are edge views of the central hub and the side plates. Figure 6 is an edge view of the turbine Wheel assembled. Figure 7 is an elevation of a portion of the hub, enlarged, with a blade set therein.

In the figures the several parts are designated by numerals as follows: similar numerals referring to similar parts throughout the several views:

The body or hub 8 is, preferably, made of steel. The hub is fitted with shaft 9 and the side plates it] which are of a larger diameter than said hub. Into the hub are cut, at an angle to a tangent to the hub radii, suitable grooves for the reception of one end of the blades or buckets l I. The blades are brazed, soldered or otherwise suitably bonded to both the hub and the side plates. A nozzle l2 serves to guide steam, compressed air or other suitable compressed gas or liquid to buckets H.

In assembling the turbine wheel of my invention, the buckets ll may be first seated in the angular grooves of the hub, above described, and brazed, soldered, or otherwise suitably secured to the hub 3. The side plates H) are then positioned against the side faces of the hub and the side edges of the buckets ll. These side plates are secured to the hub sides and bucket edges in any suitable manner, as by brazing, soldering, or the like. As will be clear from a study of the drawings, the buckets II at their outer edges may extend to the periphery of the side plates I0, whereby the buckets II are supported at three edges by the hub 8 and the two side plates ID.

The particular feature of this turbine wheel is that the slots for the reception of one end of the blades II are cut in the hub 8 at an angle to the radii of the hub as indicated, the better to resist the centrifugal force in its tendency to throw the blades from the hub. It should be noted that the blades are held in place by bonding them to both the hub and the side plates. The blades, as shown, approximate the shape of the letter N with that portion of the N of V form, extending from the hub 8. That side of the blade extension serving as the hollow or inner side of the V is presented to the impact of the gas or liquid stream.

I claim:

1. A turbine wheel comprising a hub, side plates secured to both side faces of said hub, said side plates being of larger diameter than said hub, and a series of blades secured to the periphery of said hub and to both of said side plates, said hub having slots parallel to the axis thereof, and at an angle to the respective radii of the hub, and the inner ends of said blades being engaged in said slots, the impact receiving surfaces of said blades being constituted by two plane surfaces parallel to the axis thereof and at an angle to the axis of said hub and at an angle to each other.

2. A turbine wheel comprising a hub; side plates secured to both side faces of said hub, said side plates being of larger diameter than said hub, a series of slots in said hub parallel to the axis thereof and at an angle to the respective radii of the hub, a series of blades of N shape, each of said blades having one leg of the N inserted in one of said slots, the extending portions of said blades constituting the impact receiving surfaces being secured to both of said side plates.

3. A device according to claim 2 in which both extending portions of each' N are disposed at angles to the respective radii of the hub.

l. A turbine wheel comprising a hub, side plates secured to both side faces of said hub, said side plates being of larger diameter than said hub, a series of slots in said hub parallel to the axis thereof and at an angle to the respective radii of the hub, a series of blades of N shape, each of said blades having one leg of the N inserted in one of said slots, the extending portions of said blades constituting the impact receiving surfaces.

PHILIP H. STEVENSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 968,862 Ljungstrom Aug. 30, 1910 1,063,331 Dake June 3, 1913 1,063,537 Hall June 3, 1913 1,217,282 Dake et a1. Feb. 27, 1917 1,292,038 Phillip Jan. 21, 1919 1,331,110 Hutchens Feb. 17, 1920 1,388,686 Zaugg Aug. 23, 1921 FOREIGN PATENTS Number Country Date 14,885 Great Britain June 19, 1897 422,352 Great Britain Jan. 10, 1935 

